$14.99 - Fan 40x40x20 5V 4 Pin PWM Noctua Nf-a4x20 5000 RPM Chipset Fan - Tinkersphere
High Quality Noctua Nf-a4x10 Flx 40mm 12v 5v 40x40x10 Cooling Fan 4010 Silent Cooler Fan Radiator 3d Printer Parts For Ender 3 - 3d Printer Parts & Accessories - AliExpress